Noise Sources for 0.1 - 1.0 THz

This research is responsive to NASA SBIR Subtopic S11.03: Technologies for Passive Microwave Remote Sensing (SBIR), Scope Title: Components or Methods to Improve Sensitivity, Calibration, or Resolution of Microwave/Millimeter-Wave Radiometers; specifically, the bullet item “Noise sources from G-band up to 1 THz with >6 dB ENR (excess noise ratio).” VDI’s primary goal is the development of noise sources with sufficient stability for radiometry that can be extended throughout the 0.1 – 1 THz range for scientific and commercial applications. This goal is being achieved by initially focusing on the frequency bands that will enable NASA’s remote sensing programs, such as V-WiSHeS and PolSIR, as well as weather monitoring programs. The project has four objectives – • The development and fabrication of noise diodes, using new materials and designs. • The packaging of the noise diodes into noise sources, for specific frequency bands of interest to NASA and to demonstrate and develop the technology. • The development of noise source characterization methods and specifications for the noise sources that ensure performance and quality. • An evaluation of the noise sources for use in Waveguide-based Internal Calibration, which can enable radiometer system simplification. NASA funds will be used for personnel (design, diode-IC fabrication, assembly, testing, and evaluation) and procurement of custom machined waveguide housings. The initial target market is atmospheric remote sensing and weather monitoring. Additional markets include laboratory measurements of receivers, radiometers, and LNAs. The noise sources developed will be immediately available to the scientific community and commercial markets.